This study investigated the relationship among social, emotional adjustment and academic achievement of undergraduate students of Ahmadu Bello University, Zaria, Kaduna State Nigeria. The study adopted a correlational survey research design. The target population of the study were six thousand, six hundred and thirty five (6, 635) male and female undergraduate student of Ahmadu Bello University, Zaria, Kaduna State Nigeria. The sample of the study were 351 respondents drawn from 300 level students. Data was collected using social adjustment inventory (SAI), Emotional Adjustment Inventory (EAI) and CGPA for the academic achievement of the student. The collected data was processed and analyzed using descriptive (frequencies, mean and standard deviation) and inferential statistics (Pearson product moment correlation and T- test). All tests were done at a 0.05 level of significance of the study indicates that the finding shows that positive relationship exist between social, emotional adjustment and academic achievement among undergraduate student with the following values; social adjustment and academic achievement of the undergraduate student r=0.889, p=.000. Emotional adjustment and academic achievement of the undergraduate student r=.575, p=.000. Social economic background of undergraduate student r=.506, p=001. Emotional adjustment and social - economic background of undergraduate student r=.469, p=0.125. Social adjustment relationship in male and female undergraduate student, 0.125 p=0.332. Emotional adjustment difference in male and female undergraduate students r=0.076. from the results of the findings it is recommended that the university management should have functional psychological testing and counseling centresin all the facultiesre- address student with social and emotional problem in order to foster positive adjustment when necessary.